| 摘要 |
Process for the manufacture of a grid comprising cutting a series of equal-length, parallel slits in a blank, each primary slit having a first neighboring slit on one side that is co-extensive with one-half of the primary slit and a second neighboring slit on the other side that is co-extensive with the other one-half of the primary slit, so that an area of double width appears beside each primary slit.
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